Manhole-cover



(No Model.)

J. P. ROB. MANHOLE COVER.

No. 521,733. Patented June 19, 1894.

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UNITED STATES v,PA,T1-irrtGistron.

JAMES P. ROE, OF POTTSTOWN, PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 521,733, dated June 19, 1894.

Applicativi; met April 1'1, 1894.

To all whom; it may concern:

Be it known that I, JAMES P. ROE, a subject of the Queen of Great Britain, residing at Pottstown, in the'county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in Covers or Plates for Manholes, Hand-Holes, and Sludge- -Holes of Steam-Boilers and Tanks an dzother Purposes; and I do hereby declare the following to be a full, clear, andexact'description of theinvention, such as will enable others skilled in the art vto which it. appertains Vto make and use the same.r l l This invention relates, generally, to plates or covers for the man-holes, hand-holes, and

sludge-holes of steam boilers, tanks, and the like, and, particularly, to wrought iron or steel plates or covers for such holes made ofa single piece of such metal pressed or stamped the desired shape and formed with means for securing the retaining bolts there'- to without penetration of the metal of the plate orcover, and it has for its object to provide such a plate or cover at the least possible cost of manufacture, to reduce its weight without reducingy its strength, and otherwise to produce such a plate or cover of simple construction, and great durability, and whichV will do away with all possibility of leakage at thepoints where the bolts are secured to the plate or cover, and itconsists of the parts and combinations of parts hereinafter more fully described and pointedout in the claims.

In the accompanying drawings forming a part of this specification, Figure 1 is a plan viewtofl one form of my improvedv plate; Fig. 2` ayertical section on the line 'wf-w, Fig. l; Fig. 3 a plan view of a modified form of plate; Fig. 4 a vertical section on the line --x, Fig. 3; Fig. 5 aplan View off-another form of plate l adapted for one or more bolts;-Fig. 6 a Vertical sectionon the line y-g/,Fig 5; Fig. 7 a plan view of another form of plate adapted for two bolts; Fig. 8 a vertical section on the linev z-z, Fig. 7 Fig. 9 a sectional View of a modified form of securing the bolt to the man-holes, hand-holes, sludge-holes and the serial No. 507,171. (No man.)

therein either when castor afterward, by p drilling,` to receiveV the'bolt or bolts bywhich they are secured imposition, thus weakening the plates andrendering them liableto leak'v about the bolt holes.' To obviate the annoyanceoccasioned by the leakage in such plates or covers cast iron plates have'been cast solid `andwith recessed lugs projecting therefrom to receive the heads of the bolts therein which lugs add to the Weight and consequent costV without increasing the strength of the plate and as the entire strain` ofsupporting the plates, which are made very heavy in order to stand the pressureto which they are subjected when in use, falls on the lugs there isliability of their breaking at most inopportuno times. In order to obviate these objectionable features in plates or covers for the purposes named `I form them of wrought iron or steel,

pressing or stamping them into the desiredv shape and with means for securing the bolt or bolts firmly, but removably, in place without adding materially to the weight of -the plates or covers, and without weakening the same by perforations, thereby materially reducing the cost of manufacturing the lplates and increasing their durability, and lessening the labor involved in itting them in and in removing them therefrom. p

Referring to the drawings A represents a position plate or cover for man-holes, hand-holes and the like purposes, which is, as is usual, Otan on which it may be used, the construction of the plates or covers in the different figures of` the drawings varying only as to ythe shape or form given the central or .body portions thereof as will now be described.

Referring to Figs. 1 and 2, it will be seen IOO.

the mouth of the recess b. At the ends of the recess b the bottom thereof inclines to the surface of the plate or cover and at the center of the recess a `rounded projection f is formed or struck up in the bottom for a purpose to be described. With this form of plate but one bolt is used.

In Figs. 3 and 4; I show a plate having an elliptical" shaped depression, Ve extending around the central portion of the plate and a 'circular recess b formed central therein the may be formedtherein if desired to receive two ormore bolts in which event a corresponding number of depressions e may be formed in the plate--one for each recess`-of the shape shown but of less diameter, but it will beunderstood that the recess or recesses may be formedin the plate without the de` pressions which, while convenient, are not `absolutely necessary to the result I attain.

In Figs. 5 and G is shown a plate formed to receive two or more bolts, the recess bin" this instance being substantially of the same shape as that in Figs. l and 2 but of `a greaterlength and is arranged on the transverse axis of the plate and with two or more projections f formed on its bottom according to the number of bolts to be used, instead of one as in said figures. The plate, in this instance, is formed with but one depression e which is elongated, but two such depressions may be made in the plate or it may be formed, as shown to the right hand in said Figs. 5 and 6, without depressions.

In Figs. 7 and 8 are shown, two forms of platesadapted to receive two bolts, in which figures two recesses ZJ are shown as'stamped or pressed in the plate parallel to its conjugate axis, the space intervening between said recesses being either dished or depressed as shownto the left hand in said figures, or left undisturbed and in the `same plane as the upper surface of the plate, as shown tothe right hand in said figures, as found most convenient or desirable.

All the different forms and arrangements of the recesses described have the same object in View, namely,to provide a simple and secure means for attaching the bolts n tothe plates or covers without forming perforations in said plates, and this is accomplished in the form of recesses shown in Figs. 1, 2, 5, 6, 7 and 3 by forming the bolt B with a tapered head il, which may be four sided, adapted to tightly or snugly lit within the recess, said head being inserted from either end of the recess and forcibly driven under the edges thereof, the elasticity ot the metal of the plate permitting this to be done without fear of damage thereto. The heads of the bolts for the recesses in the plates shown in the figures namcdhare formed with a concavlty m adapted to fit over the projections f 1n the bottoms of the recesseswhen driven into said recesses and thus prevent lateral movement `In Figs. 3 and 41the recess b is `formedl to receive a round headed bolt o into `wh ich said bolt is forcibly driven, the metal yielding as in the other forms to permitof the `.entrance of the head of the bolt and springing 1 back over the same after it has been driven fully into the recess. As` the bolt4 is supported at all sides bythe wallsof the recess in this form of construction the projection f used in the other forms described for thelpurpose of preventing lateral movement is not necessary. 1 f V In Fig. 9 Ishow indetail a method ofse curinga bolt having a tapering or conical head 19 in a recess bof va similar form but large enough to permit of the ready insertion of the bolt head Without the use of force, said head being secured firmly in place `by Babbitt or other metal r filling the space in the recess surrounding the head.

In Fig. 10 I show a modified form of making the bottom of the recess b so as to obviate the use of the projection f in the recesses and the concavity in the head of the bolts shown in Figs. 1, 2, 5, 6, 7 and 8,in which View a depression s is formed in the bottom ot" the recess to receive the head of the bolt and prevent its lateral movement.

` Having thusdeseribed` my invention, what I claim as new, and desire to secure by Letters Patent,is-

` l. A plate or cover forthe man holes,'hand holes, or sludge holes, of steam boilers, tanks, and for other purposes, consisting of a wrought iron or steel sheet or plate pressed or stamped to i shape and formed with a recess in its outer face adapted `to receive and hold `a bolt rigidly in a plane atright-angles to said plate or cover, substantially as described.

2. In a plate or cover for the man-holes, hand-holes, and sludge-holes of steam boilers, tanks, and thelike, formed of wrought iron or steel pressed or stamped the desired shape and having a dove-tailed recess stamped or pressed therein, and a bolt having `a tapering head adapted to fit within said recess, substantially as described.

3. In a plate or cover for the manholes, hand-holes and sludge-holes of steam boilers,

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tanks, andthe 1ike,.formed of Wrought iron or steel pressed or stamped the desired shape, having a recess stamped or pressed therein, and formed with a projection in its bottom, and albolt havinga head adapted to fit within said recess and formed with a concavityv to t over said projection, substantially as described. j

5. In a plate or cover for the man-holes, hand-holes, and sludge-holes of steam boilers, tanks, and other similar vessels or receptacles, of wrought iron or steel pressed or stamped in the desired shape and having a re- ,A cessstamped or pressed in said plate, a bolt having a head adapted to enter said recess, and means for securing said bolt rigidly in said recess in a plane at right angles to the plate, substantially as described. h

In testimony'whereof I attix my signature 1n presence of two witnesses.y L

\ JAMESP. ROE.

' Witnesses:y vWILLIAli/r F. LAOHMAN, J. H. MAXWELL. 

